Test JS script file

Selected file: 051null_comparison.js
Compare console.log() outputs in browser and NodeJS.
Notice: Open browser's console in FireBUG!

  1. 001syntax_unicode.js
  2. 010number_DecToHex.js
  3. 011number_HexToDec.js
  4. 012number_toExponential.js
  5. 013number_modulo.js
  6. 014number_division_by_zero.js
  7. 015number_NaN.js
  8. 016number_infinity.js
  9. 017number_isFinite.js
  10. 018number_isNaN.js
  11. 019number_negative_zero.js
  12. 020number_float_rounding_error.js
  13. 030string_htmlTags.js
  14. 030string_multiline.js
  15. 031string_length.js
  16. 032string_concatenate.js
  17. 032string_concatenate2.js
  18. 033string_minus.js
  19. 035stringmethods_charAt.js
  20. 035stringmethods_concate.js
  21. 035stringmethods_indexOf.js
  22. 035stringmethods_match.js
  23. 035stringmethods_match_memory.js
  24. 035stringmethods_replace.js
  25. 035stringmethods_search.js
  26. 035stringmethods_split.js
  27. 035stringmethods_toString.js
  28. 035stringmethods_toUpperCase.js
  29. 035stringmethods_trim.js
  30. 036string_regexTest.js
  31. 040bool_falsy.js
  32. 040bool_truthy.js
  33. 041bool_comparison.js
  34. 042bool_conditional_operator.js
  35. 043bool_logic_operators.js
  36. 044bool_not_exe_function.js
  37. 050null_typeof.js
  38. 051null_comparison.js
  39. 053undefined_var.js
  40. 054ReferenceError.js
  41. 055global_object_browser.js
  42. 055global_object_node.js
  43. 056global_properties_browser.js
  44. 056global_properties_node.js
  45. 057wrapper_object.js
  46. 058wrapper_object_readonly.js
  47. 60object_reference.js

..:: Source code - 051null_comparison.js ::..

/**
 * comparison of null and empty string
 */

console.log(Boolean('' == null)); //false
console.log(Boolean('' === null)); //false
console.log(Boolean(0 === null)); //false
console.log(Boolean({} === null)); //false
console.log(Boolean({} == null)); //false

console.log('--------------');

var x = null;
if (!x) {
 console.log('x is null');
} else {
 console.log('x is not null');
}
 

..:: NodeJS Console - 051null_comparison.js ::..

$ node 051null_comparison.js 
false
false
false
false
false
--------------
x is null

$ps -aux | grep node (list all node processes)
sasa        1273  0.6  0.4 1302908 79804 ?       Ssl  Sep21 210:42 node /home/sasa/.pm2/modules/pm2-logrotate/node_modules/pm2-logr
sasa        1293  1.2  0.8 11723192 136488 ?     Ssl  Sep21 413:53 node /home/sasa/dex8/dex8-api/starter.js
sasa        1298  0.4  0.4 1304348 72112 ?       Ssl  Sep21 160:30 node /home/sasa/regoch/regoch-www/server
sasa        1309  0.4  0.4 1299932 66952 ?       Ssl  Sep21 146:19 node /home/sasa/dex8/dex8-panel/server/index.js
sasa        1320  0.9  0.6 11810752 102196 ?     Ssl  Sep21 307:34 node /home/sasa/dex8/dex8-www/server/index.js
sasa        1329  0.6  0.5 11806180 93764 ?      Ssl  Sep21 214:00 node /home/sasa/mikosoft_hr/www-mikosoft-hr/server/index.js
sasa        1340  0.8  0.5 1198776 82588 ?       Ssl  Sep21 280:31 node /home/sasa/mikosoft-info/api-mikosoft-info/starter.js
sasa        1357  0.4  0.4 1302964 72384 ?       Ssl  Sep21 147:34 node /home/sasa/mikosoft-info/www-mikosoft-info/server/index.js
sasa        1381  0.4  0.3 1297080 65040 ?       Ssl  Sep21 145:17 node /home/sasa/dex8/dex8-kiosk/server/index.js
sasa        1417  0.7  0.5 11821292 97112 ?      Ssl  Sep21 233:29 node /home/sasa/mikosoft-info/dodo-mikosoft-info/server/index.js
sasa        1474  0.8  1.4 11973864 244244 ?     Ssl  Sep21 270:40 node /home/sasa/voovuu/voovuu-pub/server/index.js
sasa        1477  0.4  0.4 11794680 77556 ?      Ssl  Sep21 158:54 node /home/sasa/@mikosoft/dodo-examples/server/index.js
sasa        1966  0.9  0.7 11832644 130764 ?     Ssl  Sep21 325:12 node /home/sasa/mikosoft-info/crypto-mikosoft-info/server/index.
sasa     1041499  0.8  0.8 22323020 139056 ?     Ssl  Sep27 200:45 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1041553  2.2  0.9 22326636 147532 ?     Ssl  Sep27 532:09 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1041586  0.4  0.4 1102184 67256 ?       Ssl  Sep27 104:55 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1041612  0.4  0.3 1101408 65380 ?       Ssl  Sep27 104:48 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1041650  0.4  0.4 1102176 66640 ?       Ssl  Sep27 105:21 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1041678  0.4  0.4 1101924 67052 ?       Ssl  Sep27 105:04 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1041713  0.4  0.4 1100900 65588 ?       Ssl  Sep27 104:45 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1041745  0.4  0.4 1101668 66348 ?       Ssl  Sep27 104:54 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1041773  0.4  0.3 1100388 64956 ?       Ssl  Sep27 101:51 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1041811  0.4  0.4 1100896 66036 ?       Ssl  Sep27 102:36 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1372729  0.0  0.1 196316 20600 ?        Dsl  01:44   0:00 node /usr/local/lib/node_modules/pm2/lib/ProcessContainerFork.js
www-data 1372736  0.0  0.0   2608   592 ?        S    01:44   0:00 sh -c ps -aux | grep node
www-data 1372738  0.0  0.0   3304   656 ?        S    01:44   0:00 grep node
sasa     4036687  0.6  0.5 1138768 92716 ?       Ssl  Oct13   5:37 node /home/sasa/voovuu/voovuu-api/starter.js